Interrupter especially suitable for use in wireless telegraphy



March 3, 1931. I w BUBB 1,794,669

INTERRUPTER ESPECIALLY SUITABLE FOR UsE IN WIRELESS TELEGRAPHY Filed May 8 1924 canoe/01.

WlLLlAM F BUBB Patented Mar. 3, 1931 UNITED STATES PATENT OFFICE WILLIAM FREDERICK BUBIB, OF MITCHAM, ENGLAND, ASSIGNOR TO RADIO CORPORA- TION OF AMERICA, A CORPORATION OF DELAWARE INTERRUITER ESPECIALLY SUITABLE FOR USE IN WIRELESS TELEGRAIPHY Application filed May 8, 1924, Serial No. 711,785, and in Great Britain May 30, 1923.

This invention relates to interrupters especially those of the type used in wireless telegraphy.

The object of this invention is to provide an interrupter or buzzer in which the frequency of interruption can be varied at will within certain limits.

According to this invention the vibrating blade is firmly secured at both ends while the contact cooperating with the blade can be mover. along the blade. Preferably one end of the blade is carried by the magnetic yoke of the bobbin while the other end is secured. to a fixed pillar and the co-operating contact which is composed of some metal with a high melting point. such as platinum, is mounted on a spring carried by a pin, capable of being adjusted in varying positions in a slot which is parallel to the length of the blade and is formed in a fixed bracket.

My invention is illustrated by the accompanying drawing, Figure l of which is a side elevation of a buzzer constructed in accord ancetherewith, Figure 2 is a plan and Figure 3 is an end View partly in section.

A is the vibrating blade which. is secured at one end by a screw B to a fixed bracket C and at the other end by a screw D to the yoke E of the bobbin F. G is a platinum contact 1 carried by a C shaped spring H, the ends P of the spring being secured to a bar R secured to the end of a threaded pin J provided with a knurled head K. The pin passes through a tapped block or nut L which can be moved )arallel to the length of the blade A in a slot l I formed in a fixed bracket N. The block has a. thread cut on its exterior and on this is mounted a knurled nut O by which the block L can be clamped in any position along the slot so as to vary the partof the blade with which the point G makes contact. Moreover, by turning the head K the distance of the contact point G from the blade can be adjusted as desired.

Having described my invention what I claim is 1. An interrupter comprising a blade secured at both ends, a cooperating contact, a support for the contact adjacent the blade and means for adjusting the position of the point of contact along the support to vary the period of vibration of the blade.

An interrupter con'iprising an electromagnet having a blade. fixed post, a contact point and a spring holder for said point. said blade being fastened at one end to the yoke of the electromagnet and at the other end to the fixed post and means for adjustment of the contact point and its holder substantially parallel to themselves along the blade.

3. An interrupter comprisng an electromagnet having a blade, a fixed post, said blade being fastened at one end to the yoke of the electromagnet and at the other end to the post, a contact, a support for the contact adjacent the blade and means for adjusting the position of the point of contact along the support.

4. An interrupter comprising a. blade secured at both ends, a cooperating contact, a support for the contact adjacent the blade, means for adjusting the position of the contact along the support to vary the period of vibration of the blade and clamping means for fixing this position.

5. An interrupter comprising an electromagnet having a blade, a fixed post. said blade being fastened at one end to the yoke of the electromagnet and at the other end to the post, a support for the contact adjacent the blade, said support having a slot parallel to the blade, a block slidable in said slot, said block having av threaded external portion for fastening the block to the support, a threaded rod passing through the block, a contact i'nountcd at one end of the rod adjacent the blade. said rod being adapted to adjust the gap between the blade and the contact.

6. An interrupter comprising a blade mounted to have a natural period of vibration, a member, means providing relative adjustment of said member lengthwise of said blade, a spring having its ends secured to said member and a device carried by said spring between its ends and contacting with said blade.

VILLIAM FREDERICK BUBB. 

